Simple Web snapshot

import java.util.Date;

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class WebSnap {

    public static final int PNG = SWT.IMAGE_PNG;
    public static final int BMP = SWT.IMAGE_BMP;
    public static final int JPG = SWT.IMAGE_JPEG;
    public static final int GIF = SWT.IMAGE_GIF;
    public static final int TIFF = SWT.IMAGE_TIFF;

    private Display display;
    private Shell shell;
    private Browser browser;

    /**
     * 截圖寬度
     */
    private int width;
    /**
     * 截圖高度
     */
    private int height;

    /**
     * @param width
     *            截圖寬度
     * @param height
     *            截圖高度
     * @param url
     *            目標網址URL
     */
    public WebSnap(int width, int height, String url) {
        this.width = width;
        this.height = height;
        this.display = new Display();

        this.shell = new Shell(this.display);
        this.shell.setLayout(new FillLayout());
        this.shell.setSize(width, height);
        this.shell.setText("Web Snap");

        this.browser = new Browser(this.shell, SWT.NONE);
        this.browser.setSize(width, height);
        this.browser.setUrl(url);
    }

    /**
     * @param file
     *            圖片存檔路徑
     * @param swtImageType
     *            圖片存檔類型
     */
    private void snap(String file, int swtImageType) {
        Image data = new Image(this.display, this.width, this.height);
        this.browser.print(new GC(data));
        ImageLoader il = new ImageLoader();
        il.data = new ImageData[] { data.getImageData() };
        il.save(file, swtImageType);
        data.dispose();
    }

    /**
     * @param file
     *            圖片存檔路徑
     * @param swtImageType
     *            圖片存檔類型
     * @param sleepTick
     *            延遲時間
     */
    public void asynSnap(final String file, final int type, final long sleepTick) {
        new Thread() {
            public void run() {
                try {
                    Thread.sleep(sleepTick);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                WebSnap.this.display.asyncExec(new Runnable() {
                    public void run() {
                        WebSnap.this.snap(file, type);
                        WebSnap.this.shell.dispose();
                    }
                });
            };
        }.start();
        this.waitForDispose();
    }

    private void waitForDispose() {
        while (!this.shell.isDisposed()) {
            if (!this.display.readAndDispatch()) {
                this.display.sleep();
            }
        }
        this.display.dispose();
    }

    public static void main(String[] args) {
        int width = 1024, height = 768;
        String url = "http://tw.yahoo.com";
        String file = String.format("w%d.png", new Date().getTime());

        WebSnap ws = new WebSnap(width, height, url);
        ws.asynSnap(file, WebSnap.PNG, 18000);
    }

}